Update Digg shared some more details about how its search feature relaunched earlier this year works.

Sammy on the company blog says Were using Apache SOLRLucene which helped us scale horizontally and solved many of our relevancy issues as well as enabling discovery of new content through facets. Beyond site search, the rich set of features has allowed us build a platform that enables other features such as Related By Source and Related By Keywords.He also points to a podcast discussing it.Original ArticleJust as Digg was launching the controversial DiggBar, Kevin Rose also announced that the company was readying an improved search feature.